REC - aren't you surprised that it defeated a slightly larger male Red Terror though? In it's hometown, now it's in the festae's backyard it's getting chased around like no tomorrow

But still - they fought properly, non stop, and the GT got the better of it.
Put it this way REC, I don't have as much experience with cichlids as you and many others, I have more exp. with channas and characins and misc' oddballs, but I've never had a cichlid kill another fish before this. I own a 6 inch male loisellei who is not that aggressive, less aggressive than this little GT was in the smaller tank. I've also had a few oscars, jag, friedrichsthallii, dovii, tilapia mariae etc
I also have a 6 inch dempsey that used to be an absolute pyscho and battered most of my other fish, but now it's totally cool. The 2 most aggressive cichlids I have now are the 2 terrors. The little salvini I have used to be extremely aggressive until one day a firemouth fought back, then the salvini became the whipping boy of the GT and firemouth.
Are Gt's kind of like dempseys then in that they're more aggressive when young and chill out as they grow?
BTW yours is a nice one, I like the prominent mask, and the bold uniform markings on the side and the thick orange on the tail. Mine is smaller and chubbier with less colour on the side and tail, but loads of orange on the dorsal fin.
Also although the green terror is a really pretty, charming little fish I do prefer my festae slightly. He's certainly not spectacular looking now at 3" but he's very funny, and has a lot of personality, more than any of my other cichlids actually.